Genetic interaction of the histone chaperone with double strand break repair genes in .

(human HIRA) is a histone chaperone and transcription factor involved in establishment of the centromeric chromatin and chromosome segregation, regulation of histone transcription, and cellular response to stress. We carried out a double mutant genetic screen of and mutations in double strand break repair pathway. We find that functions after the MRN complex which initiates resection of blunt double strand break ends but before recruitment of the DNA damage repair machinery.

Assays to Study Mitotic Recombination Outcomes.

The fission yeast--has emerged as a powerful tractable system for studying DNA damage repair. Over the last few decades, several powerful in vivo genetic assays have been developed to study outcomes of mitotic recombination, the major repair mechanism of DNA double strand breaks and stalled or collapsed DNA replication forks. These assays have significantly increased our understanding of the molecular mechanisms underlying the DNA damage response pathways.

An Assay to Study Intra-Chromosomal Deletions in Yeast.

An accurate DNA damage response pathway is critical for the repair of DNA double-strand breaks. Repair may occur by homologous recombination, of which many different sub-pathways have been identified. Some recombination pathways are conservative, meaning that the chromosome sequences are preserved, and others are non-conservative, leading to some alteration of the DNA sequence.